BO-Doped LATP Glass-Ceramics Studied by X-ray Diffractometry and MAS NMR Spectroscopy Methods.

Two families of glasses in the LiO-AlO-BO-TiO-PO system were prepared via two different synthesis routes: melt-quenching and ball-milling. Subsequently, they were submitted to crystallization and yielded the LiA.Ti(PO) (LATP)-based glass-ceramics.

Ga-Se connectivities and proximities in gallium selenide crystal and glass probed by solid-state NMR.

We introduce two-dimensional (2D) Ga-Se through-bond and through-space correlation experiments. Such correlations are achieved using (i) the J-mediated Refocused Insensitive Nuclei Enhanced by Polarization Transfer (J-RINEPT) method with Ga excitation and Se Carr-Purcell-Meiboon-Gill (CPMG) detection, as well as (ii) the J- or dipolar-mediated Hetero-nuclear Multiple-Quantum Correlation (J- or D-HMQC) schemes with Ga excitation and quadrupolar CPMG (QCPMG) detection. These methods are applied to the crystalline β-GaSe and the 0.

Self-Healing Glassy Thin Coating for High-Temperature Applications.

Glass thin films (with nanometer to micrometer thicknesses) are promising in numerous applications, both as passive coatings and as active components. Self-healing is a feature of many current technological developments as a means of increasing the lifetime of materials. In the context of these developments, we report on the elaboration of the first self-healing glassy thin-film coating developed specifically for high-temperature applications.

Immobilization of radioactive iodine in silver aluminophosphate glasses.

Silver aluminophosphate glasses have been investigated as matrices for the immobilization of radioactive iodine. In this study, up to 28mol% AgI have been incorporated without volatilization thanks to a low temperature synthesis protocol. Alumina was added in the composition in order to increase the glass transition temperature for a better thermal stability in a repository conditions.

Characterization of lead, barium and strontium leachability from foam glasses elaborated using waste cathode ray-tube glasses.

Foam glass manufacture is a promising mode for re-using cathode ray tube (CRT) glasses. Nevertheless, because CRTs employ glasses containing heavy metals such as lead, barium and strontium, the leaching behaviour of foam glasses fabricated from CRTs must be understood. Using the AFNOR X 31-210 leaching assessment procedure, the degree of element inertization in foam glasses synthesized from waste CRT glasses (funnel and panel glasses, containing lead and barium/strontium respectively) were determined.

Characterization of self-healing glassy composites by high-temperature environmental scanning electron microscopy (HT-ESEM).

In situ high-temperature healing of cracks in composites made of glass and vanadium boride (VB) particles was observed using an environmental scanning electron microscope equipped with a high-temperature chamber (HT-ESEM). HT-ESEM is an adequate tool for studying the self-healing property of these materials. The change in crack length as a function of redox atmospheric conditions is reported.

Lead extraction from waste funnel cathode-ray tubes glasses by reaction with silicon carbide and titanium nitride.

As a possibility to clean waste CRT glass, treatment of lead-containing glass with a reducing agent, SiC or TiN, leads to a porous material containing metallic lead, Pb(0), located on the surface of the pore, and unreduced lead, Pb(II). The influences of reducing agent content, of the time, and at last of the temperature on lead reduction were analysed. Our investigations have pointed out significant differences as a function of the used reducing agent.

Influence of AlN, TiN and SiC reduction on the structural environment of lead in waste cathode-ray tubes glass: an x-ray absorption spectroscopy study.

This paper reports an x-ray absorption spectroscopy (XAS) analysis of the local structure around lead contained in foam glasses prepared with waste funnel cathode-ray tube glasses (CRT) and three reducing agents AlN, TiN and SiC. The XAS data were collected at the Pb-L(III) edge to measure the influence of the reducing agent concentration on the unreduced lead content present in the glass. XANES spectra have been demonstrated to be a linear combination of both pure metallic lead and funnel glass spectra, with a significant modification of the funnel spectra for the highest contents of reducing agent.